Volcanic eruptions and cold summers leave lasting marks in the wood of northern trees, unlocking the secrets of past climate extremes.

A simple blue stain could force trees into giving up their memories of cold summers and volcanic winters, a recent study ...

In order to grow properly, trees need an adequate period of warmth during their growing seasons; otherwise, the cell walls of new growth won't develop correctly and create blue rings that appear ...

Overall, only 2.1% of the pine trees' rings and 1.3% of the juniper shrubs' rings were blue; the cells which hadn't lignified properly were mainly found at the end of growth rings, in latewood ...

In the sampled trees, researchers found that blue rings were common between 1902 and 1877. Around 96 per cent of pine trees and 70 per cent of juniper shrubs revealed blue rings from 1902 and 84 ...

The beauty of a green, fresh-cut tree is one of the highlights of the holiday season. If you’re among the millions of Americans who still treasure a fresh-cut Christmas tree, a trip to your ...

Selecting Mount Iškoras in Norway for a search for blue rings, a team of researchers took samples from 25 pine trees and 54 juniper shrubs, representing the species Pinus sylvestris and Juniperus ...

Since trees and shrubs can live for hundreds of years, identifying these blue rings allows us to spot cold summers in the past. By looking at pine trees and juniper shrubs from northern Norway ...